SK17762001A3 - Flange profile for attachment to abutting air channel elements - Google Patents

Abstract

The invention relates to a flange profile (1) for attachment to abutting air channel elements and for receiving angle brackets for forming an assembly frame. According to the invention, the flange profiles have an essentially L-shaped cross-section. An L-limb (2) is profiled as a double-walled (3, 4) limb, which is open on one side and which is provided for overlapping the edge areas of the air channel elements, and the other limb (5) is profiled as a hollow cavity (8) for receiving a limb of an angle bracket. In the transition area of both of these limbs (2, 5), a backward folding (9a, 9b) by 180 DEG forms a double wall, which separates both limbs and which touches one of the wall areas (6, 7) with its backward folded lug. The aim of the invention is to achieve a greatest possible tightness in the transversal or longitudinal direction of the profile. To this end, the wall area (6 or 7) and the backward folded lug (9a or 9b) are joined to one another by means of a laser weld seam (10).

Description

Technical field

FIELD OF THE INVENTION The present invention relates to a flange profile for mounting on the contact edges of air ducts and for receiving corner angles forming a mounting frame, the flange profile being substantially L-shaped in cross-section, the lower arm of which consists of two walls with a gap between them a hollow chamber is provided in the vertical leg of the flange profile to accommodate the angle bracket arm, and at the transition point between the legs of the flange profile a 180 ° recess is formed on one of the walls separating these arms from each other. .

BACKGROUND OF THE INVENTION

The invention is based, for example, on German utility model no. 91 14 679-U1 of the same applicant or of the flange profiles described in EP-0 085 355-A1 or DE-32 03 204-A1.

Known flange profiles, in particular the flange profile according to German utility model no. 91 14 679-U1, characterized in that they already provide a high degree of tightness against air leakage from the air duct. Additional seals within the flange profile are also known, for example from DE 36 18 822 C2, DE 43 03 150 A1 or DE 93 20 128 U1. However, leaks may still occur, especially if the air ducts are slightly bent so that air can penetrate between the air duct wall and the flange profile fitted, and this can then cross laterally through the flange profile area that serves to accommodate the corner bracket arm .

SUMMARY OF THE INVENTION It is an object of the invention to overcome the above drawback.

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The problem is solved and the drawbacks of the known solutions of this kind are largely eliminated by the flange profile for mounting on the contact edges of the air ducts and for locating the corner angles forming the mounting frame, the flange profile being substantially L-shaped in cross section. with an open gap between these walls to surround the edges of the air duct on one side, a hollow chamber is provided in the vertical flange leg to accommodate the corner angle arm, and at the transition point between the flange arms, a 180 ° recess is formed according to the invention, the principle of which consists in that the wall and the return bend are connected to each other by a laser weld seam.

Due to the laser weld seam, it is possible to form part of the flange profile as a hollow chamber and close the hollow chamber airtight to the region of the flange profile which slides onto the air duct. The laser weld seam ensures that there is no risk that the flange profile is twisted or otherwise deformed when welding, as with conventional weld seams.

Said hollow chamber may be formed in the flange profile in various ways, for example, such that the laser weld seam is located in a smooth, in a working position in the plane of the gap of the front wall of the vertical arm.

If the backward bend is formed inwardly in a sheet located in the plane of the separating joint, the laser weld seam is located in the plane of the separating joint facing away from the rear wall of the vertical arm. The result of this sealing of the flange profile region above the laser weld seam is the same as in the case of a return bend formed on the opposite wall.

It goes without saying that the laser weld seam does not necessarily have to be passable. As is known from welding techniques, the laser weld seam can also be interrupted, in which case it is not so much the tightness but the stiffness of the thus produced flange profile against twisting.

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BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is further elucidated with reference to the accompanying drawing, in which:

FIG. 1 shows a first embodiment of a flange profile according to the invention;

FIG. 1a shows a section through a detail of the flange profile of FIG. 1 with the weld seam indicated;

FIG. 2 shows a second embodiment of a flange profile according to the invention; and

FIG. 2a is a cross-sectional detail of the flange profile of FIG. 2 with the weld seam indicated.

DETAILED DESCRIPTION OF THE INVENTION

The flange profile 1 is cold formed from a sheet metal strip and has a substantially L-shaped cross-section with a double-walled lower arm 2 whose walls 3 and 4 are slid onto the leading edge of an air channel (not shown). The vertical arm 5 of the flange profile 7 consists of walls 6 and 7, between which a hollow chamber 8 is formed, into which the arms of the corner angles can be inserted in the working position, which is not further described here.

The functionally identical elements in FIG. 1 and 2 are designated with the same reference numerals.

The front wall 6 of the vertical arm 5, in which the hollow chamber 8 is formed, is in the working position in the plane of the dividing joint in both embodiments. An elastic seal or the like is then placed on this wall 6. In the example of FIG. 1, the hollow chamber 8 is delimited by the downward folding of the sheet 9a, which forms a rear wall 7 from the plane of the separating joint.

In the case of FIG. 2, the hollow chamber 8 is delimited by a downward deflection 9b of the sheet which forms the plane of the dividing line forming the front wall 6.

Obviously, both the sheet bend 9a and the sheet bend 9b always rest on the opposite wall, in the first case on the front wall 6 and in the second case on the rear wall 7. The top of the return bend 9a, 9b is on this wall 6, 7 according to the invention fastened by a laser weld seam 10, as can be seen in particular from the enlarged details of FIG. 1a and 2a.

Claims (3)

PATENT CLAIMS A flange profile (1) for mounting on the contact edges of the air ducts and for accommodating corner angles forming a mounting frame, the flange profile (1) being substantially L-shaped in cross-section, the lower arm (2) of which consists of two walls ( 3, 4) with an open gap between these walls (3, 4) on one side for enclosing the edges of the air duct, in the vertical leg (5) of the flange profile (1) a hollow chamber (8) is provided between the shoulders (2, 5) a flange (9a, 9b) is formed on one of the walls (7, 6) at 180 [deg.] At one of the walls (7, 6) separating these arms (6, 7) from each other and contacting the opposite wall (6, 7) ), characterized in that the wall (6, 7) and the return bend (9a, 9b) are connected to each other by a laser weld seam (10). The flange profile according to claim 1, characterized in that the laser weld seam (10) is located in a smooth, in a working position in the plane of the gap of the front wall (6) of the vertical arm (5). The flange profile according to claim 1 or 2, characterized in that the laser weld seam (10) is located in the distal plane of the distal rear wall (7) of the vertical arm (5).